This article provides brief information on the history and prominent botanists exploring the surroundings of Prague. it is dedicated to V. Skalický, who intensively studied Prague flora in the second half of the 20th century. Two new sites of C. rivulare and C. heterophyllum in Prague are described. While the occurrence of C. rivulare can be found in numerous and vital populations in the Šárecký potok valley. and Jiří Hadinec.